separated AlignmentFile and AlignedSegment testing
separated AlignmentFile and AlignedSegment testing

daler/pysam,brendanofallon/pysam,brendanofallon/pysam,daler/pysam,brendanofallon/pysam,mattions/pysam,daler/pysam,kyleabeauchamp/pysam,bioinformed/pysam,dannon/pysam,dannon/pysam,TyberiusPrime/pysam,nlhepler/pysam,pysam-developers/pysam,mattions/pysam,carolinux/pysam,kyleabeauchamp/pysam,brendanofallon/pysam,nlhepler/pysam,mattions/pysam,TyberiusPrime/pysam,daler/pysam,carolinux/pysam,carolinux/pysam,nlhepler/pysam,daler/pysam,carolinux/pysam,dannon/pysam,pysam-developers/pysam,kyleabeauchamp/pysam,pysam-developers/pysam,dannon/pysam,carolinux/pysam,nlhepler/pysam,nlhepler/pysam,bioinformed/pysam,kyleabeauchamp/pysam,mattions/pysam,kyleabeauchamp/pysam,bioinformed/pysam,brendanofallon/pysam,bioinformed/pysam,TyberiusPrime/pysam,TyberiusPrime/pysam,dannon/pysam,bioinformed/pysam,TyberiusPrime/pysam,mattions/pysam,pysam-developers/pysam